Transaction management class.
TDBXTransaction = class;
A TDBXTransaction is created when you call BeginTransaction. CommitFreeAndNil, RollbackFreeAndNil, or RollbackIncompleteFreeAndNil must be called to complete a transaction. The TDBXIsolation transaction isolation level can be set when the transaction is begun. SupportsTransactions must be true for an application to be able to use transactions. Nested transactions can be used if SupportsNestedTransactions is true.
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